Porn addiction is an individual problem and can only be solved by that individual. Many porn addicts are those won't don't have girlfriends or boyfriends to have sex intercourse with so they result to satisfying their pleasure by watching others engaging in it and end up masturbating. A possible solution is to go get a sex mate to have that sex with and gradually the porn addiction will die off.

You can also solved the porn addiction problem by getting a counter hobby i.e each time you feel the urge to watch porn you do something else like reading a book or playing a game and with time that porn addiction will get replace by another addiction.